ESTIMATION METHOD OF BEND-RESISTANT LIFE OF COMPOSITE BODY AND EVALUATION METHOD OF BEND-RESISTANT PROPERTY OF COMPOSITE BODY

摘要

PURPOSE: To easily estimate the bend-resistant life of a composite body such as an electric wire in which a conductor has been coated with an insulator, a flat cable or the like and to obtain the relative evaluation of the bend-resistant property of a plurality of kinds of composite bodies. ;CONSTITUTION: A master graph indicating the relationship between the maximum strain amount and the bend-resistant life of a conductor part for a composite body which has been mounted on, and attached to, a bend-resistant-property evaluation and testing apparatus (or the relationship between the deviation amount from an ideal semicircle of a bend shape and its bend-resistant life) is created in advance. Then, the maximum strain amount of the conductor part for the composite body, as an object to be estimated, which has been mounted on, and attached to, the bend-resistant property evaluation and testing apparatus (or the deviation amount from the ideal semicircle of the bend shape) is found. The found maximum strain amount (or the deviation amount from the ideal semicircle of the bend shape) is collated with the created master graph, and the bend-resistant life of the composite body is estimated. In addition, maximum strain amounts of conductor parts at a time when a plurality of composite bodies have been mounted on, and attached to, the bend-resistant property evaluation and testing apparatus (or deviation amounts from ideal semicircles of bend shapes) are compared, and the bend-resistant property of the respective composite bodies is evaluated relatively.;COPYRIGHT: (C)1996,JPO